Ram raid on Dortmund
Aaron Ramsey's scoring run continues, this time netting the winner at Dortmund.
It was all smiles for the Gunners, who stretched their unbeaten streak to 15 matches away from home.
It was also a night to remember for the travelling Arsenal faithful.
Borussia Dortmund were left to rue a slow start and now sit third in Group F.
Sergio Busquets headed home Barcelona's second goal against AC Milan.
Lionel Messi starred once again as Barca went on to claim a 3-1 victory.
Samuel Eto'o stole another goal for Chelsea, this time against Schalke.
Demba Ba completed the 3-0 victory for the Blues.
Miranda gave Atletico Madrid the lead as they stormed past Austria Vienna.
Diego Costa celebrates after scoring Atletico Madrid's fourth goal against Austria Vienna.
Florian Thauvin celebrates after bringing Marseille level at 2-2 in Napoli.
Gonzalo Higuain celebrates after he scores his second, and the winner, for Napoli against Marseille.
Lasse Schone celebrates after scoring the winner for Ajax at home to Celtic.
Helton gets down well to save Hulk's penalty as Zenit and Porto played out a 1-1 draw.
Steaua celebrate Federico Piovaccari's goal at Basel. The two teams also played out a draw.